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Episode 11 The One-Winged Fallen Angel (kanji say same thing)
Yuuta has watched Rikka as she does her best to fit into the human world but, for some reason, his heart has precipitated into lead. On the other side, Dekomori is doing her best to purify Rikka's heart of the demon eating into it, but that is not successful. And then... Rikka disappears from the town.
(No staff credits available at this time)

Episode 11 The One-Winged Fallen Angel (kanji say same thing)
Yuuta has watched Rikka as she does her best to fit into the human world but, for some reason, his heart has precipitated into lead. On the other side, Dekomori is doing her best to purify Rikka's heart of the demon eating into it, but that is not successful. And then... Rikka disappears from the town.
(No staff credits available at this time)

Episode 12: Everlasting Contract (Eternal Engagement)
Yuuta is worrying about disappearance of Rikka. During that time he's informed by the second generation Wicked Eye wielder about the reason why Wicked Eye was born. After learning the truth Yuuta rushed from the town in search for Rikka. The story about Dark Flame Master and the wielder of Wicked Eye will be concluded here.

Episode 12: Eternal Engagement (Kanji are for "never ending contract")
Yuuta is uneasy over Rikka's disappearing. While he is worrying, he is told why the Wicked Eye was born from the second user of its power. Knowing the truth behind her power, Yuuta heads out into the town to search for Rikka. The story of the Dark Flame Master and the user of the Wicked Eye is concluded.

Staff is correct.

Edit: also found a comment from the main female cast.
-Tell us what to look forward to in the climax of Chuunibyou.

Spoiler:

Asasaki (Nibutani): For me it sums up to "Who will take the blow for the loveable Deko-chan?"

Uchida (Rikka): In the second half of the series, you feel that Rikka and Yuuta's story seperated from everyone else, but in the remaining two episodes, everyone's hearts become one again. Look for that point.

Asakura (Kumin): Up until now, everyone's been doing their best in their own spots. In episodes 11 and 12, everyone's thoughts come together due to a development. Everyone properly sees each other, or perhaps they start to notice each other and understand anew. Kumin doesn't have any chuunibyou past and previously she watched over everyone's scuffles with warm eyes. I hope everyone looks forward to the scene where Kumin starts to become active, showing a new side to her, and everyone starts to think in a Kumin-style way to understand the situation.

Uesaka (Dekomori): While I think the development that ties Yuuta, Rikka, and everyone together is amazing, for me, my impression of Dekomori greatly changed as I performed in the 11th episode. And then it changed again in the final episode. That's my highlight. Is Dekomori a pet? A little sister? For everyone who equated her with a tiresome brat, I hope you in particular watch what happens!

I'm not familiar with the other names so I was wondering who Ishidate is paired with for AD?

I really thought it would be Kigami Ueno episode.

It's Ueno. The director/storyboard info was not what was posted on 2ch, but the AD was correct. Personally, I'm waiting to see what's on the site next week before committing to someone when there's this much miscommunication.

Episode 12: Eternal Engagement (Kanji are for "never ending contract")
Yuuta is uneasy over Rikka's disappearance. While he is worrying, he is told why the Wicked Eye was born from the second user of its power. Knowing the truth behind her power, Yuuta heads out into the town to search for Rikka. The story of the Dark Flame Master and the user of the Wicked Eye is concluded here.
Script: Junki Hanada Director/Storyboards: Taichi Ishidate Animation Director: Chiyoko Ueno

I honestly had that same exact thought as well, the only other people that I could think of even having a small chance of being the second user is her mom (what a twist!) or one of Yuuta's little sisters, but I don't think they had that much contact with Rikka so I doubt it.